Desulfurization wastewater evaporation and concentration and heat recovery system

Abstract

The invention provides a desulfurization wastewater evaporation and concentration and heat recovery system. According to the system, a desulfurization wastewater evaporation device, a desulfurizationwastewater circulation pump and a desulfurization wastewater heater are sequentially connected to form a desulfurization wastewater circulation loop; the desulfurization wastewater heater, a boiler flue gas exothermic cooler and a heat medium water circulation pump are sequentially connected to form a heat medium water circulation loop; a boiler flue gas exothermic cooler adjustment bypass is arranged between a heat medium water inlet and a heat medium water outlet of the boiler flue gas exothermic cooler; a steam outlet of the desulfurization wastewater evaporation device is connected with asteam inlet of a steam condenser; the steam condenser, a boiler air supply and heat absorption heater and a cooling water circulation pump are sequentially connected to form a cooling water circulation loop; and a boiler air supply and heat absorption heater adjustment bypass is arranged between a water inlet and a water outlet of the boiler air supply and heat absorption heater. The system is capable of carrying out desulfurization wastewater evaporation and concentration at a relatively low cost, and achieving a relatively good energy saving effect, and is simple in structure, safe, reliableand good in energy saving effect.

Description

technical field [0001] The invention relates to a desulfurization wastewater evaporation concentration and heat recovery system, which belongs to the technical field of wastewater treatment of desulfurization systems in thermal power plants. Background technique [0002] The vast majority of coal-fired power plants in my country adopt wet desulfurization process, which will produce a large amount of desulfurization wastewater. The desulfurization wastewater has been highly regarded by the environmental protection industry due to its complex composition (including suspended solids, fluoride, heavy metals and salt, etc.) and environmental pollution. focus on. In order to achieve zero discharge of desulfurization wastewater, it is usually necessary to evaporate and concentrate the pretreated desulfurization wastewater. [0003] At present, the most widely used evaporation and concentration methods in China are MED multi-effect evaporation technology, MVR mechanical vapor recomp...

AI Technical Summary

Problems solved by technology

MED multi-effect evaporation requires additional consumption of high-parameter steam generated by the boiler; MVR mechanical vapor recompression evaporation technology requires additional consumption of plant power

High-parameter steam and factory electricity are both high-grade heat sources, and the above two technical routes lead to high concentration costs

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